Department of Animal Physiology, College of Veterinary Science, AAU, Khanapara, Guwahati-781 022, India.
*Corresponding author.
Oestrus was induced in 20 prepubertal indigenous heifers of Assam by applying norgestomet (Crestar) ear implant and 300 IU PMSG. Another 20 heifers that received saline served as control. Oestrus behaviour of the animals was noticed by visual means and by parading vasectomized bull. Among the behavioural symptoms of oestrus genital discharge, acceptance of male and mounting on herd mates and males were predominant in heifers induced to oestrus. Oestrus symptoms were similar in induced and natural pubertal oestrus, though proportion of animals displaying different symptoms varied between the two categories.
